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Re: .ident & company (was Re: Basic block profiler out of libgcc)
On Mon, May 07, 2001 at 06:35:44PM -0400, Phil Edwards wrote:
> On Mon, May 07, 2001 at 12:50:12PM +0200, Hans-Peter Nilsson wrote:
> > > So I left it in.
> > > The space issue should be solved by Jakub's string-merging patch
> > > (automatically applied to .comment section, if I read it correctly).
> >
> > Which requires binutils from CVS, assuming Jakub's patches have
> > been committed now.
>
> They must not have, or maybe they don't work on .comment.
I don't follow binutils, but I certainly thought Jakub said they'd act
on .comment. (And if not, it should be a trivial addition.)
> Using today's
> CVS sources for gcc and binutils, .ident is still accumulating quite a bit:
>
> 31% cd ~/build/install-2001-05-07/lib
> 32% ls -lF libstdc++.so.3.0.0 libgcc_s.so.0
> -rw-r--r-- 1 pme pme 207434 May 7 19:27 libgcc_s.so.0
> -rwxr-xr-x 1 pme pme 3753280 May 7 19:28 libstdc++.so.3.0.0*
> 33%
> 33% ../bin/strip -R .comment libstdc++.so.3.0.0 libgcc_s.so.0
> 34% ls -lF libstdc++.so.3.0.0 libgcc_s.so.0
> -rw-r--r-- 1 pme pme 33988 May 7 19:31 libgcc_s.so.0
> -rwxr-xr-x 1 pme pme 796944 May 7 19:31 libstdc++.so.3.0.0*
> 35%
>
> And all this time I thought we were writing bloated code in libstdc++-v3.
> Turns out it's 80% .ident strings! :-)
Did you strip those binaries first? 80% debug information _including_
.comment I can believe; 80% just .comment, no.
$ size -A libstdc++.so.3.0.0
libstdc++.so.3.0.0 :
section size addr
.hash 20408 148
.dynsym 48752 20556
.dynstr 129601 69308
.gnu.version 6094 198910
.gnu.version_r 128 205004
.rel.data 13256 205132
.rel.eh_frame 12496 218388
.rel.gcc_except_table 736 230884
.rel.ctors 16 231620
.rel.got 2080 231636
.rel.plt 3416 233716
.init 37 237132
.plt 6848 237172
.text 301456 244032
.fini 28 545488
.rodata 8448 545536
.data 12668 558080
.eh_frame 70376 570748
.gcc_except_table 10160 641124
.ctors 16 651284
.dtors 8 651300
.got 2760 651308
.dynamic 176 654068
.sbss 0 654244
.bss 3832 654272
.stab 869820 0
.stabstr 1116789 0
.comment 1890 0
.note 40 0
Total 2642335
> I've been following this thread lately because it raises the same questions
> that storing the command-line options in the .comment or .note sections
> would; see the change-request thread taking place under PR 2678.
If we were to store the command line options, that certainly would
make the .comment section (.note has a defined meaning which is not
that, doesn't it?) a lot bigger...
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